16..My father started to give up smoking last year.
=>My father has..............................................
17.They have worked in that factory since 2001.
=>They started.....................................................
18. Lan hasn't written to Maryam for a month.
=>Lan didn't.........................................................
19. How long have you learnt French ?
=>How long ago.........................................?
20. How long have you bought this car ?
=>When did................................?
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Sinh Học lớp 12
